" wohrle사의 제품으로 입력 키패드 오동작 및 보드, 시스템 오작동의 시스템 1대 브라운관 모니터 백화현상 1대- - - 모니터 교체 필요. Note: If a sustain pedal plugged into a Yamaha keyboard is producing the opposite effect - sustaining when the pedal is not depressed not sustaining when it is depressed - it' s usually because ( a) the pedal was plugged in while the keyboard was turned on ( b) the pedal was depressed while the unit was powering on.